Safety composite-color print.



PATENTED DEC. 6, 1904.

P/E. IVES. Y

SAFETY COMPOSITE COLOR PRINT.

36 MODEL.-

APPLIOATION'IILED SEPT. 14, 1903.

59% Imam mszlywzaw i'mizdi'ed H3215; mzd

I nitric dramas lPatented December 6, 1904.

arnarr IFFICE.

' ears-"W com osure-cocoa PRINT.

srncrnrcn 'rioia forming part of Letters Patent No, 776,515, dated. December 6, 19cc.

I Application filed September 14:, 1908. Serial No. 173,139. (No model.)

I To all whom, it may concern:

Be it-known that I, FREDERIC E. Ives, a citizen of theUnited States, residing in WeehawkemNew Jersey, have invented certain Improvements' in Safety Com posits-Color Prints,

of which the following is a specification.

The object of myinvention is to provide a composite-color design made up of well-difierentiated hues of such character as will make it difiicult or impossible to reproduce separately one or more of its elements by a photographic process, thereby preventing reproduction of the design by photomechanical means.

In the accompanying drawings, Figure 1 is a diagrammatic. View illustrating the relation to the solar spectrum of difierent combinations of colors which I may use in carrying out myv invention. Fig. 2 is a view showing different elementsof a safety composite-color print made in accordance with my invention.

Fig. 3 is an exaggerated section of part of the complete print,'andFig. i is a view show- Y ingsuperposed the different elements of the composite print.

In carryingout myinvention I print different designsin different colors superposed upon the same surface, preferably with crossing and interweaving ofthehn'es of the different dcs1gns,,thus forming a composlte-color design.

I It is desirable that the colors or designs 'emeach paira keyscolor and a check color, the latter absorbing those spectrum-rays which are absorbed by the lighter or key color, so

; I that the key-color design cannot be photographed as black without'at the same time photographing as black the companion or check color design of a different hue.

In placeof such a combina colors to each other is shown in 1,;i1r I which I 2 3 i 5 6 7 represent divisions of the visible spectrum of sunlight, the vertical lines being the Fraunhofer lines. which serve as natural divisions between the most distinctive spectrum colors and the heavy horizontal blacklines representing the-relative spectrum absorption of the printing colors named at the right. It should be understood that this representation of the various absorptions is merely diagrammatic. Any number of such colors may be used to print separate designs to form characteristic parts of a whole; but the principle may be illustrated by a composite design in tw colors only. Thus in Fig. 2 the design shown by dotted lines 1 may represent a key color-say rhodamine-pink and the design shown by full lines 2 a suitable check color of diiferent hue -say methyl-blue.

The check-color design may be separately photographed as black ona white ground'by the action of the orange-red spectrunrrays;

but the key-color design can only be photo-- graphed as black by the action of the yellow green spectrum-rays, which would also photo graph the check color as blaclr and so fail to separate the key design.

It will be evident that the same pink-color design would alsoserve as acheck color for a capri-blue key-color design, and there would .be a combination of two key-- color'designs'and one 'check-colondesign with all of the hues quite distinctiine,"and the two protected keyrcolor. :designs would onlyless perfectly protect. the check-coiorjdesigu itself. It is-also evidentthat the cheek color (methyl-blue) is optically simiiar to a mixture of the two key colors (capri-blue and rhodamine-pink) and that such a mixture may be colorwhich :here serves as a check color tor the rhodamme substituted for the methyl-blue-in fact, such 2. mixture of two key colors forms a very acceptable check color.

In most cases the spectrum absorption of a checkcolor'extends in one direction only beyond that of the key color, making it optically similar to a mixture of two key colors. At 7 in Fig. 1, however, an example is given in which the spectrum absorption of the check -color (methyl-violet) extends both to the right and to the left of the spectrum absorption of the keycolor, (rhodamine-pink,) although the two colors'are well differentiated.

Owing to the fact that the check colors absorb moreof the spectrum and are therefore deeper to the eye than the key colors, I prefer to make the check-color designs in somewhat finer lines than the key-color d.esigns.

It may'happen that the colors employed have unlike absorptions in the dark ultra-violet rays of the spectrum, which are invisible,

to the eye, but to which photographic plates are sensitive, and I therefore prefer to employ as an additional check a white or colorless ground or' design in a substance-such, for instance, as white lead-which strongly absorbs the ultra-violet spectrum-rays. Such ground design is shown by the cross-lined element 3 of Fig. 2, although in practice the.

lines or other elements of, the ground design will not be visible to the eye.

. Having thus described my invention, I claim v and desire to secure by Letters Patent 1. A safety composite-color print compristo ultra-violet spectrum-rays.

3. A safety composite-color print having a design in white or colorless material opaque to ultra-violet spectrum-rays.

4. A safety COIDPOSIliGrCOlOI' print consisting of several superposed designs each printed in a distinctive color, but with the spectrum absorption of at least one of the colors com prising that ofanother. I

5. A safety composite-color print consistingof several superposed designs eaohprinted in-a distinctive color but with the spectrum absorption of at least one of thecolo'rs comprising that of another, in combination with terial opaque to the ultra violet spectrumrays, v V

In testimony whereof I have signed my name 4 aground or design in white or colorless mato'this specification in the presence of two subscribing witnesses.

FREDERIC E. IVES. W itnesses:

WILL. ASE-ARR, J os. H. KLEIN. 

